Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 9 years ago.
Improve this question
First of all here is my C++ source:
#include <iostream>
using namespace std;
void number(int x){
cout << "Number is: " << x << endl;
}
int main(){
cin >> int x;
number(x);
return(0);
}
Upon compiling I get the following errors:
file.cpp: In function 'int main()':
file.cpp:9:9: error: expected primary-expressing before 'int'
file.cpp:9:9: error: expected ';' before 'int'
file.cpp:10:9: error: 'x' was not declared in this scope
I compile and run this successfully in CodeBlocks but under Ubuntu with gcc or g++ things fail.
Change
int main(){
cin >> int x;
to
int main(){
int x;
cin >> x;
Related
Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 6 days ago.
Improve this question
New to C++ here, following outdated training videos...
Trying to compile this simple code, but getting the below error:
#include <iostream>
int main(){
auto result = (10 <=> 20) > 0;
std::cout << result << std::endl;
}
Error I get is:
prog.cc: In function 'int main()':
prog.cc:4:25: error: expected primary-expression before '>' token
4 | auto result = (10 <=> 20) > 0;
|
What am I doing wrong?
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 1 year ago.
This post was edited and submitted for review 1 year ago and failed to reopen the post:
Original close reason(s) were not resolved
Improve this question
Here is my code
#include <iostream>
using namespace std;
int main() {
int age;
cin >> age;
cout << "Age is " << age << endl;
return 0;
}
Whenever I run the program, I get errors saying that 'cout', 'endl' and 'cin'are not declared in this scope. I looked up this problem online and I made sure I had the "using namespace std;".
Another post mentioned this was a bug and said that to fix this bug I would change
""C_Cpp.intelliSenseEngine": "Default" to "C_Cpp.intelliSenseEngine": "Tag Parser"."
I did this and it still doesn't work. Anyone have any ideas?
Edit: Here is the Error Code:
PS C:\School\C++\C++ VSD> cd "c:\School\C++\C++ VSD\" ; if ($?) { g++ test.cpp -o test } ; if ($?) { .\test }
test.cpp:3:2: error: invalid preprocessing directive #using
#using namespace std;
^~~~~
test.cpp: In function 'int main()':
test.cpp:7:5: error: 'cin' was not declared in this scope
cin >> age;
^~~
test.cpp:7:5: note: suggested alternative:
In file included from test.cpp:1:
C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:60:18: note: 'std::cin'
extern istream cin; /// Linked to standard input
^~~
test.cpp:8:5: error: 'cout' was not declared in this scope
cout << "Age is " << age << endl;
^~~~
test.cpp:8:5: note: suggested alternative:
In file included from test.cpp:1:
C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:61:18: note: 'std::cout'
extern ostream cout; /// Linked to standard output
^~~~
test.cpp:8:33: error: 'endl' was not declared in this scope
cout << "Age is " << age << endl;
^~~~
test.cpp:8:33: note: suggested alternative:
In file included from C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/iostream:39,
from test.cpp:1:
C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/lib/gcc/x86_64-w64-mingw32/8.1.0/include/c++/ostream:590:5: note: 'std::endl'
endl(basic_ostream<_CharT, _Traits>& __os)
You have to add #include <iostream> on the beginning of your file. then it should work properly
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 2 years ago.
Improve this question
I am new in C++ and i have a little error in this program "Hello world"
//ejemplo funciones definidas por el usuario
#include<iostream>
using namespace std;
int visualizar();
int main()
{
visualizar();
return 0;
}
void visualizar() //Here is the error
{
cout<<"Hola mundo guay\n";
}
Error:
C:\Users\lisan\OneDrive\Desktop\c++\EjemploFunciones.cpp In function 'void visualizar()':
15 17 C:\Users\lisan\OneDrive\Desktop\c++\EjemploFunciones.cpp [Error] ambiguating new declaration of 'void visualizar()'
6 5 C:\Users\lisan\OneDrive\Desktop\c++\EjemploFunciones.cpp [Note] old declaration 'int visualizar()'
What does this error mean? What caused it? How do I fix it?
In your prototype of visualizar, you declared it as
int visualizar();
However, when you defined it, you wrote
void visualizar() { ... }
Notice that the return types are different. Did you mean to use void throughout?
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 4 years ago.
Improve this question
I have a template function makeMatrix(), code is:
template<size_t N>
void makeMatrix(string dataFilePath, int adjcMatrix[N][N])
{
fstreamExtension fe("adj.txt", ios::in|ios::binary);
string s;
vector<int> temp;
int i = 0;
while(!fe.eof())
{
getline(fe, s);
temp = tokenizeToInt(s, ",\n")); //error: expected ';' before ')' token|
for(int j = 0; j < N; j++)
adjcMatrix[i][j] = temp[j];
i += 1;
}
}
fstreamExtension is a class I created and is included in program through header
#include "fstreamExtension.h", other included headers are iostream string and boost/tokenizer.hpp.
code for tokenizeToInt():
vector<int> tokenizeToInt(string& intString, const char* seperators)
{
vector<int> intValues;
boost::char_separator<char> delims(seperators);
boost::tokenizer<boost::char_separator<char>> tokens(intString, delims);
for (const auto& t : tokens) {
intValues.push_back(atoi(t.c_str()));
}
return intValues;
}
Why it is causing a compilation error in the makeMatrix(), the syntax seems correct, I didn't called it in main(), was compiling some other code then this error popped up when I started a build.
IDE : codeblocks 16.01, gcc.
You should listen to what the compiler tells you. Often the error is simpler than you think:
temp = tokenizeToInt(s, ",\n")); //error: expected ';' before ')' token|
An extra right-parenthesis. The compiler error means "I thought you were done with this command, why are you trying to close another parenthesis-pair?"
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 9 years ago.
Improve this question
I have recently worked on C, but I have started to study C++. I had a homework in to create a program that would read texts and organize data out of the imputed text. This is the last part I have left, but I don't get what's wrong with my code. This part of the problem is pretty simple, but I still don't understand what my errors are. I got used to gcc compiler which wrote mostly segmentation fault, but g++ compiler errors are different. Any tips or hints on what to pay more attention while transferring from c to c++ would be really appreciated.
This is my output errors.
-bash-3.2$ g++ -o Printfunction Printfunction.cpp
Printfunction.cpp: In function 'void Printfunction(wordList*)':
Printfunction.cpp:43: error: cannot convert 'NumberList*' to 'Numberlist*' for argument '1' to 'std::string returnlist(Numberlist*)'
Printfunction.cpp: In function 'std::string returnlist(Numberlist*)':
Printfunction.cpp:56: error: invalid use of undefined type 'struct Numberlist'
Printfunction.cpp:10: error: forward declaration of 'struct Numberlist'
Printfunction.cpp:56: error: 'to_string' was not declared in this scope
Printfunction.cpp:57: error: invalid use of undefined type 'struct Numberlist'
Printfunction.cpp:10: error: forward declaration of 'struct Numberlist'
Can you please tell me what's wrong with my code?
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
struct NumberList
{
int line;
struct Numberlist *nextPtr;
};
struct wordList
{
string word;
int Count;
NumberList lines;
struct wordList *nextPtr;
};
void Printfunction(wordList *list);
string returnlist(Numberlist *list);
int main()
{
wordList something;
something.word = "SOMETHING";
something.Count = 55555;
something.nextPtr = NULL;
Printfunction(&something);
}
void Printfunction(wordList *list)
{
int i;
i=1;
cout<<"+----+----------------------------+-------+---------------------------------+"<<endl;
cout<<"|# | WORD | COUNT | LINES |"<<endl;
cout<<"+----+----------------------------+-------+---------------------------------+"<<endl;
while(list != NULL)
{
cout<<"|"<<left<<setw(4)<<i<<"|"<<left<<setw(28)<<list->word<<"|"<<left<<setw(7)<<list->Count<<"|"<<left<<setw(33)<<returnlist(&(list->lines))<<"|"<<endl;
cout<<"+----+----------------------------+-------+---------------------------------+"<<endl;
list = list->nextPtr;
i++;
}
}
string returnlist(Numberlist *list)
{
string final;
while(list != NULL)
{
final.append(", ");
final.append(to_string(list->line));
list = list->nextPtr;
}
final.append(".");
return final;
}
The problem is that sometimes you spell it NumberList, and sometimes you spell it Numberlist.
Any tips or hints on what to pay more attention
Case matters.